package com.ymm.websocket.demo.server;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.PathVariable;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @Description: TODO
 * @Author: Xuecheng Li
 * @CreateTime: 2022-08-10 10:53
 * @Version: 1.0.0
 */
@Slf4j
@ServerEndpoint("/api/websocket/{sid}")
@Component
public class WebSocketServer {
    //静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
    private static AtomicInteger onlineCount = new AtomicInteger(0);

    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();

//    public static IDetRecordService detRecordService;
    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;

    private String sid;

    @OnOpen
    public void onOpen (Session session, @PathParam("sid") String sid) {
        this.session = session;
        webSocketSet.add(this);
        this.sid = sid;
        onlineCount.getAndIncrement();
        try {
            sendMessage("connect-success");
            log.info("用户上线，当前在线人数：{}",onlineCount.get());
        } catch (IOException e) {
            log.error("无法建立websocket连接，请重试!");
        }
    }


    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        //从set中删除
        webSocketSet.remove(this);
        //在线数减1
        onlineCount.getAndDecrement();
        //断开连接情况下，更新主板占用情况为释放
        log.info("释放的sid为：{}",sid);
        //这里写你 释放的时候，要处理的业务
        log.info("有一连接关闭！当前在线人数为：{}",onlineCount.get());

    }

    /**
     * 收到客户端消息后调用的方法
     * @Param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("收到来自窗口{}的信息:{}",sid,message);
        //群发消息
        for (WebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                log.error("群发消息失败！！！，请重试");
            }
        }
    }


    /**
     * @Param session
     * @Param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }

    /**
     * 群发自定义消息
     */
    public static void sendInfo(String message, @PathParam("sid") String sid) throws IOException {
        log.info("推送消息到窗口" + sid + "，推送内容:" + message);

        for (WebSocketServer item : webSocketSet) {
            try {
                //这里可以设定只推送给这个sid的，为null则全部推送
                if (sid == null) {
//                    item.sendMessage(message);
                } else if (item.sid.equals(sid)) {
                    item.sendMessage(message);
                }
            } catch (IOException e) {
                continue;
            }
        }
    }
}
